Marlene,
Your symptoms could be the result of many problems and since one hears a lot about cancer readily assumes one has all these symptoms, and your mind can play some funny tricks. Search the Internet for the best medical service that is available in your area. Cost is a factor but without health, you do not have anything. One thing that I would like to suggest get a second or third opinion. Find out who is the best medical service in your area, just keep searching until you have the answer. You could have a home problem with some products causing you allergies or? Maybe new carpeting, new paint, etc. there are many reasons. If you are taking medication, find out what the side effects are and let your Dr. know of your condition. Just keep digging until you have the answer. Ask many questions, make yourself notes what you would like to ask the Dr.
Keep a log of the foods you eat, maybe change your diet. Nutrition and exercise are the most important factors of our existence. Keep yourself positive and busy and with an open mind to follow and you will see results. Respectfully, Regine